Blank Window or MsgBox with 64-bit

I seem to remember asking this question but can't find it.If compile or debug my app as a 64-bit versus 32-bit, I have windows and/or msgboxes show up empty.This is on High-Sierra.Does anyone else have this problem?

I also cannot define this in that it Always happens. The only thing I can be sure is my XOJO cache hasn't been cleaned in a while, but that shouldn't be just because I haven't cleaned my cache.